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Abstract

We present a method to control the harmonic process by a mid-infrared modulated
generalized polarization gating for the generation of the broadband
supercontinuum. Using a mid-IR generalized polarization gating modulated by a
weaker mid-IR linearly polarized chirped field, the ionization, acceleration and
recombination steps in the HHG process are simultaneously controlled, leading to
the efficient generation of an ultra-broadband supercontinuum covered by the
spectral range from ultraviolet to water window x-ray. Using this method we
expect that isolated sub-100 attosecond pulses with tunable wavelength could be
obtained straightforwardly.

Figures (8)

(a) The solid black line is the driving field Ex
and the dotted red line is the gating field Ey
of the generalized polarization gating unmodulated by the chirped pulse. (b)
Electron trajectories (The ionization and recombination times are shown in
unfilled blue cycles and red crosses, respectively.) of HHG in the
generalized polarization gating unmodulated by the chirped pulse and
ellipticity (solid black line).

(a) The solid black line is the driving field Ex
and the dotted red line is the gating field Ey
of the generalized polarization gating modulated by the chirped pulse. (b)
Electron trajectories (The ionization and recombination times are shown in
unfilled blue cycles and red crosses, respectively.) of HHG in the
generalized polarization gating modulated by the chirped pulse and
ellipticity (solid black line).